Mikuni Hsr42 Easy Carburetor Kit For Harley 1200 Sportster / Buell With Aftermarket Air Cleaner Features Replaces stock CV carb for more power and dependability Features a two-piece throttle slide rolling on stainless bearings for much smoother operation Benefits include better performance, excellent throttle response, and easier starting Pre-jetted and ready to run, per application 42 mm carburetor smoothbore Venturi offers great airflow Enlarged needle and seat for extended full throttle operation Adjustable accelerator pump provides instant throttle response at any RPM Light throttle return spring for easy pull operation Works with stock manifold and throttle cables Kit includes high flow backing plate and mounting hardware Uses aftermarket air cleaners